Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
12th Edition
ISBN: 9781259587399
Author: Eugene Hecht
Publisher: McGraw-Hill Education
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Chapter 19, Problem 21SP
An incandescent lamp filament has an area of 50 mm2 and operates at a temperature of 2127 °C. Assume that all the energy furnished to the bulb is
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An incandescent lamp filament has area 40 mm and operates at a temperature of 1127°C.Assume that all the energy furnished to the bulb is radiated from it. If the filament's emissivityis 0.83, how much power must be furnished to the bulb when it is operating
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A bulb delivers 33 W of radiant energy when its filament is at 1900 °C . If the temperature increases by 100 °C , what is the new rate of energy radiated by this bulb?
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Chapter 19 Solutions
Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
Ch. 19 - 9. What temperature gradient must exist in an...Ch. 19 - Prob. 10SPCh. 19 - 11. Suppose the area of a window on a passenger...Ch. 19 - 12. The temperature on the inside face of a glass...Ch. 19 - 13. A sheet of ice 1.0 m by 1.0 m and 1.0 cm thick...Ch. 19 - Prob. 14SPCh. 19 - 15. How many grams of water at 100 °C can be...Ch. 19 - 19.16 [II] A certain double-pane window consists...Ch. 19 - 17. Determine the R value for a 2.54-cm-thick...Ch. 19 - Prob. 18SP
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- The surface area of an unclothed person is 1.50 m2, and his skin temperature is 33.0C. The person is located in a dark room with a temperature of 20.0C, and the emissivity of the skin is e = 0.95. (a) At what rate is energy radiated by the body? (b) What is the significance of the sign of your answer?arrow_forwardWhy is a person able to remove a piece of dry aluminum foil from a hot oven with bare fingers, whereas a burn results if there is moisture on the foil?arrow_forwardWhat is the rate of heat transfer by radiation, with an unclothed person standing in a dark room whose ambient temperature is 22.0C. The person has a normal skin temperature of 33.0C and a surface area of 1.50 m2. The emissivity of skin is 0.97 in the infrared, where the radiation takes place.arrow_forward
- A bulb delivers 25 W of radiant energy when its filament is at 1500 °C . If the temperature increases by 300 °C , what is the new rate of energy radiated by this bulb?arrow_forwardThe filament in a light bulb has a diameter of 0.02 mm and an emissivity of 1.0. The temperature of the filament is 3×1000°C. What should be the length of the filament in meters so it will radiate 60 W of power? The Stefan-Boltzmann constant is 5.670 × 10-8 W/m2 · K4. Please give your answer with 3 decimal places.arrow_forwardThe tungsten filament of a light bulb has an operating temperature of about 2100 K.If the emitting area of the filament is 1 cm2, and its emissivity (ε) is 0.68, what is the power output of the light bulb?arrow_forward
- A student is trying to decide what to wear.His bedroom is at 20.0 degrees Celcius.His skin Temperature is 25 degrees Celsius.The area of his exposed skin is 1.50 square mitres.People all over the world have dark skin with emessivity about 0.900.Find the net energy transfer from his body by radiation in 10.0 minutesarrow_forwardSize of a Light-Bulb Filament. The operating temperature of a tungsten filament in an incandescent light bulb is 2450 K, and its emissivity is 0.350. Find the surface area of the filament of a 150 W bulb if all the electrical energy consumed by the bulb is radiated by the filament as electromagnetic waves.arrow_forwardIn an old house, the heating system uses radiators, which are hollow metal devices through which hot water or steam circulates. In one room the radiator has a dark color (emissitivity = 0.830). It has a temperature of 64.1 oC. The new owner of the house paints the radiator a lighter color (emissitivity = 0.426). Assuming that it emits the same radiant power as it did before being painted, what is the temperature (in degrees Celsius) of the newly painted radiator?arrow_forward
- A student is trying to decide what to wear.His bedroom is at 20°c.His skin Temperature is 35.0°c.The area of his exposed skin is 1.50 sq.mitres.People all over the world have skin that is dark in the infrared,with emessivity about 0.900.Find the net energy transfer from his body by radiation in 10.0 minutes.arrow_forwardA person steps out of the shower and dries off. The person's skin with an emissivity of 0.70 has a total area of 1.2 m and a temperature of 33 °C. What is the net rate at which energy is lost to the room through radiation by the naked person if the room temperature is 24 °C?arrow_forwardA light bulb filament is constructed from 2 cm of tungsten wire of diameter 50 pam and is enclosed in an evacuated glass bulb. What temperature does the filament reach when it is operated at a power of 1 W? (Assume the emissivity of the tungsten surface to be 0.4.)arrow_forward
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